/Engine/Source/Runtime/RenderCore/Public/RenderGraphBuilder.h
Finds an RDG texture associated with the external texture, or returns null if none is found.
[FRDGTexture](API\Runtime\RenderCore\FRDGTexture) * FindExternalTexture ( [FRHITexture](API\Runtime\RHI\FRHITexture) * Texture ) const